File photoMechanical trouble was blamed when a State Highway Patrol helicopter crashed into a field near the main entrance to the prison.Request to buy this photo

AP file photoRobert B. Vallandingham was the only prison guard killed during the riot. Several others were taken hostage.Request to buy this photo

File photoArmed guards line the fence outside the prison. They assembled against the fence shortly after Vallandingham's body was taken from the prison.Request to buy this photo

AP file photoVallandingham's wife, Peggy, is seen as she is escorted to his funeral in Portsmouth, Ohio.Request to buy this photo

AP file photoAn inner circle of wives of prison guards is surrounded by a ring of ministers during a prayer service on April 15, 1993.Request to buy this photo

Ohio Highway PatrolDuring the riot, prisoners wrote messages to authorities and the media on bed linens and then hung them from windows.Request to buy this photo

File photoHostage negotiators, Dirk Prise (seated) and Highway Patrol Sgt. Howard Hudson, left, meet in the Southern Ohio Correction Facility yard with prisoner Stanley Cummings, right, and prison guard James Anthony Demons, second from right, for a live television broadcast where the prisoner listed the demands of inmates holding hostages in the prison.Request to buy this photo

File photoPrison guard James Anthony "Tony" Demons, who was held hostage during the riot, was released on April 16, 1993.Request to buy this photo

AP file photoA police car leads a parade of marchers down a hill approaching the Southern Ohio Correction Facility. The crowd expressed support for the guards being held hostage.Request to buy this photo

File photoOhio Highway Patrol Trooper Marc Rogols displays some of the handmade weapons confiscated from Lucasville prisoners during the riot. The paper bags behind him are filled with more weapons and evidence.Request to buy this photo

File photoWanda and Homer Vallandingham listen to opening statements at the trial of Jason Robb on Feb. 13, 1995. Robb was convicted of aggravated murder in the death of Robert Vallandingham.Request to buy this photo

AP file photoCarlos Sanders, one of the leaders of the riot, was convicted of aggravated murder in the death of prison guard Robert Vallandingham. Sanders was sentenced to death.Request to buy this photo